基于Marc有限元软件数值模拟连续锻造大变形过程的研究

Study on Large Deformation Numerical Simulation of Continuous Forging Based on Marc Finite Element Software

以连续锻造大变形过程为研究对象,建立了变形过程的数学模型。采用Marc有限元软件对侧压过程进行了仿真分析,并对模具结构进行优化。结果显示,连续锻造大变形过程中,板坯塑性变形不断增加,坯料内部的应力分布呈现与表面平行的层状结构;4个边界的应力大于心部的应力,出现了双鼓的分布;单斜面模具的模角在8°时,板坯没有发生翘曲现象。翘曲高度随着模角的增加而增加,形成对称的抛物线形状。对于设计的4种双斜面模具结构,最优的模具结构是α为15°、β为25°、x为80 mm,其接触面积和压力的增幅最大。

Taking the large deformation process of continuous forging as the object of study, a mathematical model of the deformation process was established. Side compression process was simulated by using of finite element software Marc.And the die structure was optimized. The results show that in large deformation process of continuous forging, the plastic deformation of the plate blank increases continuously. But the internal stress distribution of the blank is the layered structure of the parallel surface. The stresses of four boundaries are larger than the stress of the heart, the distribution of which is double drum. When the die angle of single inclined plane die is at 8°, the warping phenomenon does not occur in the slab blank. The warping height increases with the increase of die angle. It forms symmetric parabolic shape. For the 4 kinds of die structure of double inclined plane,the optimal structure of the die is that α is 15°, β is 25 ° and x is 80 mm. And the increasing of the contact area and pressure is maximum.